So at the end, the changes were as simple as I thought after checking the v2 fork commits. The only non-obvious change is the part where you fix the interests after maduration period.
Is there any technical documentation on the coin to start learning more about it and crypto-currencies in general?
Yep, pretty straightforward changes.
Our ANN here is pretty technical, and once you're comfortable looking at Bitcoin, you can understand the differences by looking at the diffs between the codebases.